<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>div 和 span</title>
</head>
<body>
  <!-- div：大盒子 -->
   <div>这是div标签</div>
   <div>这是div标签</div>
  <!-- span：小盒子 -->
   <span>这是span标签</span>
   <span>这是span标签</span>
</body>
</html>